Ta có: \(\frac{x}{y}=\frac{5}{7}\)

\(\Rightarrow\frac{x}{5}=\frac{y}{7}\)

Áp dụng tính chất dãy tỉ số bằng nhau ta có:

\(\frac{x}{5}=\frac{y}{7}=\frac{a+b}{5+7}=\frac{72}{12}=6\)

\(\Rightarrow\hept{\begin{cases}\frac{x}{5}=6\Rightarrow x=30\\\frac{y}{7}=6\Rightarrow y=42\end{cases}}\)

Vậy \(x=30;y=42\)

ta có sơ đồ :

x là 5 phần 

y là 7 phần

1 phần có giá trị là: 72:(5+7)=6

x là : 5x6=30

y là:6x7=42

em lớp 5 nhé có sai đùng k

xin lỗi tớ ko nhìn rõ

bài này mờ quá 

1.I saw/ have seen that flim aready 

2 we went / have gone to the movies three times last month

3 did you ever do / have you ever done volunteer work ?

4 i had / have had five tests so far this semester 

5 linda did / has done her homework before she went to sleep

6 she bought / has bought a neww mobile phone two days ago

1.I saw/ have seen that flim aready 

2 we went / have gone to the movies three times last month

3 did you ever do / have you ever done volunteer work ?

4 i had / have had five tests so far this semester 

5 linda did / has done her homework before she went to sleep

6 she bought / has bought a neww mobile phone two days ago

5. She took _____ playing the piano when she was a young girl

A. in

B. over

C. up

D. on

6. ___________ is her father’s hobby. He s going to the zoo to see beautiful parrots or canaries.

A. Collecting birds

B. Bird - watching

C. Raising pets

D. Arranging flowers

7. It’s interesting ______ a puppy. I enjoy _____ after it very much.

A. having/ looking

B. having/ to look

C. to have/ to look

D. to have/ looking

8. One of my favorite hobbies is ______ comics. I love _______ more famous ones.

A. read/ collecting

B. reading/ collecting

C. to read/ to collect

D. reading/ collected

9. The bus ______ in two minutes. I _____ late for school when I _____ it.

A. arrives/ will be/ miss

B. will arrive/ will be/ miss

C. arrives/ am/ will miss

D. will arrive/ am/ will miss

10. I love making ___________ because I can create some nice and unique clay bottles or cups to give my friends.

A. pottery

B. paper kites

C. architectures

D. lanterns

5. She took _____ playing the piano when she was a young girl

A. in

B. over

C. up

D. on

6. ___________ is her father’s hobby. He s going to the zoo to see beautiful parrots or canaries.

A. Collecting birds

B. Bird - watching

C. Raising pets

D. Arranging flowers

7. It’s interesting ______ a puppy. I enjoy _____ after it very much.

A. having/ looking

B. having/ to look

C. to have/ to look

D. to have/ looking

8. One of my favorite hobbies is ______ comics. I love _______ more famous ones.

A. read/ collecting

B. reading/ collecting

C. to read/ to collect

D. reading/ collected

9. The bus ______ in two minutes. I _____ late for school when I _____ it.

A. arrives/ will be/ miss

B. will arrive/ will be/ miss

C. arrives/ am/ will miss

D. will arrive/ am/ will miss

10. I love making ___________ because I can create some nice and unique clay bottles or cups to give my friends.

A. pottery

B. paper kites

C. architectures

D. lanterns